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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b061e9cdaf2647d6aee2562cb6679f85b8f5a1a751098428a566b6fc93b6c3a8' 
  AND token = 'BjfJZ8Wbec5BUErpkKTPZ00EoE+sgF3JeuVZG0FIFdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}